Cassia County ZIP Codes

Cassia County is a county of Idaho.

ZIP codes: 6
Cities & towns: 6
Area codes: 2
Land area: 2,566 sq mi

Every ZIP code in Cassia County

833xx

The complete list of Cassia County, ID ZIP codes with the city each one delivers to.
ZIP code	City
83311	Albion
83312	Almo
83318	Burley
83323	Declo
83342	Malta
83346	Oakley

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Cassia County codes above are listed without a column we would have to invent.

Cities and towns in Cassia County

A further 1 place in Cassia County appears in the postal source without a page of its own; its codes are in the table above and each one links to its own page.

Area codes covering Cassia County

Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.

Where Cassia County's ZIP codes sit

Each point is the reference point of one Cassia County ZIP code, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope every ZIP code recorded in Cassia County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated 16 July 2026. The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.